[time-nuts] Small quantity custom crystals
Mark Sims
holrum at hotmail.com
Sat Oct 2 02:25:30 UTC 2010
Nope, nothing special about the stability requirements. Hopefully the freq won't drift off channel (receivers are usually fixed freq or channeled at 10-50KHz with a VFO tweaker cap to allow some offset adjustment within the channel). They are usually highly optimized for sensitivity (< 0.1uV) and bandpass.
I did some playing with some computer crystals in the 50 MHz range and could get the circuit to work properly with them, so the crystal does not need to be a 5th overtone.
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This is comparable, then, to the wildlife transmitters for Argos (which are at 400MHz-ish).. Does this application need good medium term stability (i.e. are you making a series of Doppler measurements?)
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